One end of a cylindrical rod is kept in steam chamber and the other end in melting Ice. Now 0.5 gm of ice melts in 1 sec. If the rod is replaced by another rod of same length, half the diameter and double the conductivity of the first rod, then rate of melting of ice will be

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0.25 gm/sec

0.5 gm/sec

1 gm/sec

2 gm/sec

answer is A.

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